The Z2 and Z4 inductors are designed for a defined water flow rate with a tolerance of +/-10%. The inductors have a pressure drop of 33% of the inlet pressure. Connect the inductors to the water line. Foam is drawn through a 25 mm pick-up tube from a container at atmospheric pressure. The preset flow of foam concentrate is continuously added to the water stream.
The Z2 and Z4 inductors are developed for general fire brigade applications. To be used in combination with foam branchpipes low (S) or medium expansion (M) of the same flow characteristics.
– Proportioning ratio from 0 to 6%
– Constant proportioning rate
– Works with back pressure up to 2 bar
– Available in 200 and 400 l/min construction
The proportioning rate is continuously variable between 0 and 6%. Back pressure and friction losses of up to 2 bar are compensated by a bypass valve in the bottom of the inductor. A non- return ball valve prevents water from flowing back into the foam container once the water supply is turned off.
Recommended Foam Concentrate
With the Z2 and Z4 inductors we recommend the use of any of our SKUM foam concentrates 1%, 3% or 6%. The foam concentrate used has to be of a suitable type for the risk to be protected (e.g. ARC foam concentrates for water miscible liquid fires).